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A. G. STRATHERN.

LIFTING CLAMP 0R DOG. APPLICATION FILED DEc.2o. 191s.

1 ,$26,802. Patented D60. 30, 1919.

sTATEs PATENT oEEioE.'

ALEXANDER-GEORGE STRATHERN, OF GLASGOW, SCOTLAND.

LIFTING CLAMP 0R DOG.

Application filed December 20, 1918.

To all whom t may concern:

. Be it known that I, ALEXANDER GEORGE STRATHERN, a subject of the Kingof Great Britain and Ireland, residing at 50 Wellington street, in thecity and county of Glasgow, Scotland, have invented certain new anduseful Improvements in Lifting Clamps or Dogs, of which the following isa specication.

This invention relates to lifting clamps or dogs of the type which areintended to be used in pairs for lifting plates and other generally flatobjects on the flat, that is horizontally, by gripping or biting them atthe two ends by top and bottom pressure.

The object of the present invention is to improve such clamps of thistype as have heretofore, as far as I am aware, been ernployed orproposed and to produce a simple and effective clamp so constructed thatit can hardly be niisapplied or improperly used.

rIhe characteristics of the clamp which constitute the present inventionare that it is provided with upper and lower gripping or biting membersor surfaces which are formed integrally with each other and with thebody of the clamp, and that the bite of the said upper member or surfaceon the upper surface of the plate is beyond, or inward of, the bite ofthe said lower member or surface on the under surface of the plate. Asubsidiary feature of the invention is the provision of means forpreventing the clamp being employed upside down which would beunsatisfactory as causing the bite on the upper surface of the plate orthe like to be outward of the bite on the under surface of the plate.

The accompanying drawings illustrate the invention.

Figures 1 and 2 are elevations at right angles to each other showing theform of the clamp.

Figs. 3 and 4 show slight modifications of details.

Fig. 5 shows the application of the clamp to the lifting of a plate.

Like reference characters denote like parts in the several views of thedrawings.

Specification of Letters Patent.

Patented Dec. 30, 1919.

Serial No. 267,654.

Referring to Figs. 1 and 2, the clamp coinprises a body A formed withupper and lower jaws, at the ends of which are biting members B and Crespectively. Cr represents the plate which is being lifted. The jaws ofthe clamp and the gap A1 between the jaws are formed of suoli sizes asto insure that the members B and C shall grip or bite the plate at ashort distance from its edge and that the upper bite shall be beyond orinward of the lower bite. yThe body A is suspended by means of a shackleor link D pivoted to the body at E.

l.Vhen lifting' a plate or the like, two clamps are employed, one ateach end of the plate as shown in Fig. 5, the two clamps being suspendedby means of their shackles from a sling chain or other suitableappliance. The pull of the chain causes the mem bers B and C of eachclamp to bite the upper and lower surfaces respectively of the plate.

A snug F may be formed on the clamp to prevent the shackle beingswiveled into such a position as would admit of the clamp being usedupside down, that is with the member B below, and the member C above,the object which is being lifted, as such an arrangement would generallybe undesirable. An alternative device for effecting the same purpose isshown in Fig. a, the shackle D being provided with an extension or lugJ.

The upper biting member B may, as shown in Fig. 3, be provided with aserrated engaging surface or wear plate I-I of tem pered steel.

Havingnow 'particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is z*- 1. In a clamp for lifting platelike articles, a bodyhaving an upper and a lower jaw rigid therewith, the jaws having bitingmembers at their ends and the upper jaw projecting beyond the lower jaw.

2. In a clamp for lifting plate-like articles, a body having an upperand a lower jaw rigid therewith, the jaws having biting members at theirends and the upper jaw projecting beyond the lower jaw, the body beingprovided with an opening for the attachment of a. shackle thereto and onone to prevent the clamp from being used upside fece adjacent theopening with a snug. down. 10

3. In a clamp lor lifting plate-like In testimony whereof` I aliX mysignature articles, a body having an upper and a. lower in presence oftwo witnesses.

jaw rigid therewith, the upper aw project- ALEXANDER GEORGE STRATHERN.ing beyond the lower jaw, a. shackle pivoted Witnesses:

to the body, and means for limiting the N. E. L. CREW, swinging movementof the shackle, whereby A. E. VIDOL.

